- Fill the master cylinder reservoir with brake fluid and keep it at least 1 / 2 full of fluid at all times during the bleeding operation.
- Deplete the brake vacuum reserve by applying and releasing the brakes several times while the engine is OFF .
If the master cylinder is known or suspected to have air in the bore, bleed the unit before bleeding the calipers, in the following manner:
- Disconnect the forward (blind end) brake line connection at the master cylinder.
- Allow brake fluid to fill the master cylinder piston bore until it begins to flow from the forward pipe connector port at the master cylinder.
- Connect the forward brake line to the master cylinder and tighten.
- Have an assistant depress the brake pedal slowly 1 time and hold. Loosen the forward brake line connection at the master cylinder to purge air from the bore. Tighten the connection to 13 ft. lbs. (18 Nm), and have the assistant release the pedal slowly. Wait 15 seconds and repeat the sequence, including the 15 second pause, until all air is removed from the bore. Make sure brake fluid does not contact any painted surface.
- Repeat the procedure at the rear master cylinder brake line connection.
- If it is known that the calipers do not contain any air, it will not be necessary to bleed them.
If it is necessary to bleed all of the calipers, follow the proper sequence:
- Right rear, left rear, right front, left front.
After all air is removed from the master cylinder, bleed the individual calipers as follows:
- Place a suitable sized box wrench over the bleeder valve.
Attach a clear tube over the bleeder valve and allow the tube to hang, submerged in a clear container partially filled with brake fluid.
- Have an assistant depress the brake pedal slowly 1 time and hold. Loosen the bleeder valve to purge the air from the cylinder. Tighten the bleeder screw to 80 inch lbs. (9 Nm), and have the assistant slowly release the pedal. Wait 15 seconds and repeat the sequence, including the 15 second pause, until all air is removed.
It may be necessary to repeat the sequence 10 or more times to remove all of the air.
NOTERapid pumping of the brake pedal pushes the master cylinder secondary piston down the bore in a way that makes it difficult to bleed the system.
- Check the brake pedal for sponginess and the brake warning light for an indication of unbalanced pressure. Repeat the bleeding procedure to correct either of these conditions.